Music Hall mmf-7 spins faster

Misc. thoughts:
-Could this be caused by unusually high voltage?
BTW, in which country do you reside?
Are you using a 115 volt model on a 220 volt system?
-Are you using a Music Hall belt or something else?
-Are you using an analog preamp or is the signal being converted into digital first (with some kind of pitch adjustment after)?
-Is this effect happening to ALL of your albums?
-How long has this been happening (is this a new TT)?
-Is your motor "in the hole" of the plinth or is it outside somehow (stretching the belt)?

P.S. I'm a MMF-7 owner also.

Find someone with a multi-meter and check your voltage.
Better yet, locate a variac (voltage modifier), dial in 115 volts and see what happens.
Best of luck...

My only exposure to an audiophile grade variac was at Superior Audio (Chicago) in the mid 1990s. The propriator had a unit made by Merril Audio or Conrad-Johnson? -I can't remember. He used it to warm up his Tube amps (slowly and gently).

You could cruise Ebay or even AGon for used units.

I'm wondering if PS Audio's famous A/C conditioners have a voltage dial-in feature?

Finally, I think member TVAD could advise you better than I (BTW, TVAD is a former MMF-7 owner).

I like my MMF-7 -no problems whatsoever.

Lrmellon: Now you can swap all the parts from the new MMF-7.1 and see what happens.

I think the ".1" is a change to the tonearm.
The rest should be the same.

Good luck!